P0924JH FBM214b | Communication Input Module

Description

The FBM214b HART Communication Input Module contains eight 4 to 20 mAindividually isolated analog input channels. It supports any mix of standard 4-20 mAdevices and HART devices. The FBM214b can serve as a HARTcommunications field device host, enablingFoxboro™ DCS to request and receive two digital messages per second from the fielddevice. The message pass-through capability can be used to support HART universal,common practice, and device-specific commands, but it cannot support the burstcommunication mode. These commands are implemented using the Foxboro DCSField Device Expert for HART. For details, see Field Device Expert for HART DevicesControl and I/O (PSS 41S-10FDMHRT). The FBM214b provides individually isolated power supplies to power each of the eightchannels. Optionally, the input channels can be powered by an external power supply. However,when a common external power supply is used with two or more channels, a CableBalun module is required to help prevent HARTcommunication channel crosstalk.

Features • 8 analog input channels, each accepting one of the following inputs:  ◦ Standard 4 to 20 mA analog sensor signal  ◦ Digital HART Frequency Shift Keying (FSK) signal superimposed on a 4 to 20mA analog input signal • FSK modem dedicated to each input channel for bi-directional digitalcommunications with a HART field device • Analog to digital conversion of each of the 4 to 20 mA input signals from theHART devices • Support for the HART universal commands necessary to interface the field devicewith the Foxboro DCS database • Per channel galvanic isolation of each of the 8 input channels from each other,ground and module logic • Rugged design suitable for enclosure in Class G3 (harsh) environments • High accuracy achieved by sigma-delta data conversions for each channel • Termination Assembly (TA) for locally or remotely connecting field wiring to theFBM214b • TA for per channel internally and/or externally loop powered transmitters

Standard Design The FBM214b has a rugged extruded aluminum exterior for physical protection of thecircuits.  Enclosures specially designed for mounting the Foxboro DCS FieldbusModules (FBMs) provide various levels of environmental protection, up to harshenvironments per ISA Standard S71.04. Fieldbus Communication A Fieldbus Communication Module or a Control Processor interfaces the redundant 2Mbps module Fieldbus used by the FBMs.  The FBM214b module acceptscommunication from either path (A or B) of the redundant 2 Mbps fieldbus.  If one pathis unsuccessful or is switched off at the system level, the module continuescommunication over the active path. The use of an external power supply common to two or more loops requires a CableBalun Module to maintain communication signal line balance Cable Balun Module The Cable Balun module is used to maintain digital communication line balance forHART Transmitter to FBM loops that are powered from a common external powersupply. This powering effectively connects one line of each loop together. Without theBaluns, in each loop so powered, the common connection at the external powersupply, would cause near end crosstalk at the system end of the loop wiring cable.Loops using FBM internal power source do not require Baluns. The Cable Balun module contains multiple Baluns. One Balun segment isinterconnected in each externally powered loop (see Cable Balun Module). There isone Cable Balun module for four channels.

Main brands include: ABB, Bailey, GE, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, EMERSON EMERSON, B&R, MOTOROLA, FUANC, REXROTH, KUKA, HONEYWELL, NI, DEIF, Yokogawa, WOODWARD WOODWARD, Ryan, SCHNEIDER SCHNEIDER, Yaskawa, MOOG, EPRO, PROSOFT and other major brands

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